I bought this DW304P (DW304PK) saw from a pawn shop and decided to take it apart. Some people probably don’t realize this, but lots of tools are serviceable and require maintenance. I took this saw apart to add some new grease to the reciprocating mechanism and gears. This is also commonly done and angle grinders.
Here is the cheap moly grease I use for this sort of stuff: http://amzn.to/29i0AaB